exam Maths Puzzle Numerical Ability

Hi Can you help me solve the following problem?

Use the given information to find the constant of proportionality.
W is inversely proportional to the square of r. If r = 2, then W = 10.
k =

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exam Other Question

Simplify the expression.

17. 4c/9 + 8c/9

Any help with this equation would be Greatly</b> appreciated. Multiply as indicated
{x^ + 6x + 9/x^ - 4 * x - 2/x + 3}
{2y^ - + y - 3/4y^ - 9 * 3y + 3/5y - 5y^}
{y^ = y - 42/y - 3 / y + 7/(y - 3)^}